<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>state</title>
</head>

<body>
    <!-- 准备好一个容器 -->
    <div id="test"></div>
    <!-- 引入react核心库 -->
    <script type="text/javascript" src="../js/react.development.js"></script>
    <!-- 引入react-dom，用于支持react操作DOM -->
    <script type="text/javascript" src="../js/react-dom.development.js"></script>
    <!-- 引入babel，用于将jsx转换为js -->
    <script type="text/javascript" src="../js/babel.min.js"></script>

    <script type="text/babel">  //此处一定要写babel  
        class Weather extends React.Component {
            //初始化状态
            state = { isHot: true, wind: '微风' };
            render() {
                const { isHot, wind } = this.state;
                return <h1 onClick={this.changeWeather}> 今天天气很{isHot ? '炎热' : '凉爽'},{wind}</h1 >
            }

            //自定义方法 ————要用赋值语句的形式+箭头函数
            changeWeather = () => {
                console.log(this);
                const isHot = this.state.isHot;
                this.setState({ isHot: !isHot })
            }

        }

        ReactDOM.render(<Weather />, document.querySelector('#test'));
    </script>
</body>

</html>